Changing the Number of Replicas

You can dynamically increase or decrease the number of read replicas in your Redis
replication group using the AWS Management Console, the AWS CLI, or the ElastiCache
API. If your replication
group is a Redis (cluster mode enabled) replication group, you can choose which shards
(node groups) to
increase or decrease the number of replicas in.

To dynamically change the number of replicas in your Redis replication group, choose
the operation from the
following table that fits your situation.